Have you ever wondered why we have to have an extra day every four years? It seems baffling that we just shoehorn another 24-hours into February, but as CGP Grey so eloquently explains it’s all to do with trying to balance an imperfect calendar, something the Universe just won’t let us do.

Gizmodo reader Xian Min Zhang just sent me this impressive timelapse video from his company's latest project: a 30-story tall, 183,000-square-foot hotel built in just 360 hours. Just 15 days! I kept watching it in disbelief.